Demonstrations continued for a fourth day across the Muslim world over an amateur American-made anti-Islamic video. U.S. and other foreign missions have stepped up security following violent attacks that began Tuesday.

Protesters in several cities across the Middle East, Africa, and south and east Asia spread out after Friday's midday prayers, denouncing the video and those they feel have not done enough to stop it.

Demonstrations continued near the U.S. embassy in Cairo, with protesters throwing rocks at riot police, who responded with tear gas.

The violence also spread to Sudan, where witnesses said demonstrators breached the German embassy. Hundreds of protesters in Tripoli, Lebanon, set fire to a KFC fast-food restaurant.

Protests were also reported in Malaysia and Indonesia, and security was tight in Kabul, Afghanistan, even though there were no demonstrations.

Video of Middle East protests

In Benghazi, where the U.S. ambassador to Libya and three other American personnel were killed in an attack Tuesday, security was stepped up around the city and the airport temporarily closed.

U.S. warships are headed to the Libyan coast, while additional U.S. Marine guards were deployed to protect the American embassy in Yemen. Protesters Friday were pushed back from the embassy with water canon and warning shots, after demonstrators breached the wall the day before.

Cairo responds

In many Cairo mosques Friday, the video, a crudely-made attempt to mock the Prophet Muhammad, was the topic of the day. One imam reminded worshippers that Egyptians, under their new Islamist government, can now openly defend the prophet from such insults.

Egyptian President Mohamed Morsi has condemned the video. He spoke out again Friday on the need to keep protests in check, saying Egypt will never accept the killing of innocents, or attacks on diplomatic missions or personnel. He added it is every government's duty, including Egypt's, to protect ambassadors, missions and tourists.

The appeal for restraint followed what is being described as a frank telephone call overnight between Morsi and U.S. President Barack Obama. The Egyptian leader is reported to have brought up the video, while president Obama stressed Egypt's obligation to protect the embassy.

Obama spoke Thursday about the relationship between the U.S. and Egypt. "I don't think that we would consider them an ally, but we don't consider them an enemy," said the president. "They are a new government that's trying to find its way. They were democratically elected. I think we have to see how they respond to this incident."

Egyptian security forces were building a barrier Friday to block the route to the embassy. Egyptian police used tear gas earlier to break up the protests.

Arrests

Libyan officials said Thursday that they have arrested four people in connection with this week's assault on the U.S. consulate in Benghazi that killed U.S. Ambassador Christopher Stevens and three of his staff: information-technology specialist Sean Smith and former Navy SEALS Tyrone Woods and Glen Doherty. The officials did not provide details.

American intelligence agencies are examining the alleged involvement of pro-al-Qaida militants.

Secretary of State Hillary Clinton condemned the amateur U.S.-made movie that mocks the Islamic Prophet Muhammad. She called it "disgusting" and "reprehensible."

Demonstrations Continue Over Anti-Islamic Video

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Tracing the Video

"Innocence of Muslims" Movie

Excerpts of the film were posted on YouTube in English and Arabic

The film depicts the Prophet Muhammad as a caricature

Reportedly financed by expatriate members of Egypt's Coptic Christian minority group

Promoted by Florida-based Christian Pastor Terry Jones, who burned a Quran in his church

A trailer for the anti-Islamic video was posted on YouTube in July. An Arabic-language translation began circulating in the Middle East in recent days. Clips from the movie depict the Prophet Muhammad as a villainous, homosexual, child-molesting buffoon, among other overtly insulting claims.

The film has been widely condemned across the globe and in the United States.

Called "The Innocence of Muslims," the film was said to have been produced by a man named Sam Bacile, who told news media he is Israeli-American. A consultant on the film says that name is a pseudonym, and there are suggestions that the man behind the film is an Egyptian Coptic Christian who lives in California. There is no record of the film or its producer in Hollywood reference sources.

Several news organizations have linked the inflammatory film to an Egyptian American, 55-year-old Nakoula Basseley Nakoula, who lives in California and once was convicted of bank fraud. Nakoula says he handled logistics for the production.

Another California man who says he served as a consultant, Steve Klein, has given conflicting accounts of the film's origin and funding. Klein is the founder of anti-Muslim and other hate groups.